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Iron-doped tungsten trioxide photocatalyst and preparation method thereof

A technology of tungsten trioxide and photocatalyst, which is applied in the field of catalysis, can solve the problems of unfavorable large-scale promotion and application, high cost, and violation of environmental protection, and achieve the effects of improved catalytic activity of ultraviolet light and visible light, easy operation, and simple equipment

Inactive Publication Date: 2011-12-07
ZHEJIANG UNIV
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Problems solved by technology

In addition, the doping of noble metals such as Pd and Ag can also greatly improve the activity, but the cost of this doping method is too high, which is not conducive to large-scale application
It has also been reported that in the presence of Ag+, Cu2+, Fe3+ and Ce4+ plasmas, The activity of WO3 has also been improved, but the introduction of these ions into the water body also violates the original intention of environmental protection

Method used

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  • Iron-doped tungsten trioxide photocatalyst and preparation method thereof
  • Iron-doped tungsten trioxide photocatalyst and preparation method thereof
  • Iron-doped tungsten trioxide photocatalyst and preparation method thereof

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preparation example Construction

[0032] Method 1 A preparation method 1 of an iron-doped tungsten trioxide photocatalyst, that is, a solid-phase mixing method, comprising the following steps:

[0033] 1) At room temperature, disperse the solid powder containing tungsten and iron in the aqueous solution under vigorous stirring to form a suspension. The conversion of tungsten and iron in the raw materials is WO 3 and Fe 2 o 3 Calculation, Fe 2 o 3 The doping amount is 0.1 ~ 90% (mass percentage, WO 3 % + Fe 2 o 3 % = 100%);

[0034] 2) The suspension was stirred and ultrasonicated to make it evenly mixed.

[0035]3) The suspension obtained in step 2 is 50 ~ 95 on the rotary evaporator 0 C evaporated to dryness.

[0036] 4) The powder obtained in step 3 is evaporated to dryness and ground in a muffle furnace at 200 ~ 950 0 C calcination activation, that is, iron-doped tungsten trioxide photocatalyst.

[0037] Method 2 The preparation method 2 of an iron-doped tungsten trioxide photocatalyst, namely th...

Embodiment 1

[0060] 0.002 g of amorphous iron oxide (Fe 2 o 3 ) and 1.998 g of tungsten trioxide were dispersed in 30 mL of water, stirred evenly, ultrasonicated for 30 min, and then 70 0 C evaporated to dryness. The evaporated powder was placed in a muffle furnace at 400 0 C was calcined for 3h to obtain doped 0.1 wt% Fe 2 o 3 Tungsten trioxide photocatalyst A (see Figure 1~3 middle line A). Using the above photocatalytic activity evaluation method, adding 10 mM H 2 o 2 , after 3 h irradiation under UV light, Fe 2 o 3 , tungsten trioxide and catalyst A were 7.15%, 28.4% and 50.96% respectively. Obviously, under the same conditions, Catalyst A is more effective than Fe 2 o 3 And tungsten trioxide has stronger UV photocatalytic activity.

Embodiment 2

[0062] 0.02 g of amorphous iron oxide (Fe 2 o 3 ) and 1.98 g of tungsten trioxide were dispersed in 30 mL of water, stirred evenly, ultrasonicated for 30 min, and then 70 0 C evaporated to dryness. The evaporated powder was placed in a muffle furnace at 400 0 C was calcined for 3h to obtain doped 1wt% Fe 2 o 3 Tungsten trioxide photocatalyst B (see Figure 1~3 middle line B). Using the above photocatalytic activity evaluation method, adding 10 mM H 2 o 2 , after 3 h irradiation under UV light, Fe 2 o 3 , tungsten trioxide and catalyst B were 7.15%, 28.4% and 60.07% respectively. Obviously, under the same conditions, the UV photocatalytic activity of catalyst B was higher than that of tungsten trioxide and Fe 2 o 3 There are several times the improvement.

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Abstract

The invention provides an iron-doped tungsten trioxide photocatalyst. The photocatalyst comprises tungsten trioxide powder particles, and the tungsten trioxide powder particles comprise iron oxide with different contents and states. The photocatalyst of the invention has a significantly increased photocatalytic rate. The invention also provides a preparation method of the iron-doped tungsten trioxide photocatalyst; tungsten-containing and iron-containing compounds are used as precursors; the raw materials are finally transformed into forms of WO3 and iron oxide by processes of mixing the two compounds, grinding, high-temperature calcining and the like; and the iron oxide is distributed in WO3 in different forms so as to obtain the iron-doped tungsten trioxide photocatalyst. The raw materials used by the invention have low cost, and the equipment is simple and easy to operate; when the obtained photocatalyst is compared with simple tungsten trioxide and iron oxide, the photocatalytic activity in ultraviolet light and visible light is increased by several times.

Description

technical field [0001] The invention relates to an iron-doped tungsten trioxide photocatalyst and a preparation method thereof, belonging to the field of catalytic technology, and more specifically, the invention provides an iron catalyst with high catalytic activity to dyes and phenols under ultraviolet and visible light. Doped tungsten trioxide photocatalyst, its preparation method and optimal photoreaction conditions. Background technique [0002] With the continuous progress of human civilization, energy shortage and environmental pollution are becoming more and more serious. Therefore, the development of pollutant net treatment technology with high efficiency, low energy consumption, wide application range and deep oxidation ability has always been the goal pursued by environmental protection researchers. Semiconductor photocatalysis technology has received great attention because it can directly use various light sources including sunlight at room temperature to comple...

Claims

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Application Information

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IPC IPC(8): B01J23/888A62D3/10
Inventor 许宜铭毕冬琴
Owner ZHEJIANG UNIV
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